The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 41
s tends to set the needleB iS PRACTICAL TELEPHONE HANDBOOK horizontally. This force is opposed by gravity, the lower halfof the needles length being made heavier than the upperhalf, so that the sensitiveness of the instrument will dependto a great extent upon the difference in weight between… … Fig. 11 such as the internal resistance of a battery. The other wind-ing has a large number of turns of thin wire, having a re-sistance of about 150 ohms. This winding is used when testingcircuits of high resistance, and for roughly measuring theE.M.F. of cells. For important measurements, recourse…
Telephone
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